The world's largest laser-cut diamond was unveiled in Dubai, and 555.55g black diamond, the world's largest laser-cut diamond, was exhibited in Dubai, United Arab Emirates on June 5438+07. This rare collection of black diamonds is thought to have started with meteorites or planets that hit the earth. This black diamond named "Secret" has 55 faces and is certified by Guinness World Records as the largest diamond in the world. After the exhibition, The Secret will be exhibited in Los Angeles, and then auctioned by online Sotheby's on February 3rd. According to statistics, the price of the transaction volume will be at least 5 million yuan (about 43.34 million yuan), and it will be paid in digital currency.
Black diamond, also known as black diamond, is a kind of pure natural polycrystalline diamond, which is produced in Central Africa, China and Brazil. Usually black, crimson and dark gray, it has excellent strength and ductility, and the greater the strength and ductility, the better. Diamonds with higher porosity than other diamonds have become one of the most popular decorations in the upper class. Among all kinds of diamonds, black diamonds are especially precious because of their scarcity. The black diamond ring represents emotional anxiety, sadness and gray. I don't like emotional excitement and self-evident mentality, and I avoid too deep friendship. In western countries, black is a sad color. Few people usually wear black diamond ornaments.
Most natural black diamonds tend to appear black because many tiny mineral inclusions fill the whole diamond, such as high-purity graphite cysts, hematite or hematite. Another possibility is that this kind of diamond has many cracks or cracks, which are dyed black because of graphitization, and finally the accumulation of inclusions leads to the black diamond. It is precisely because this kind of diamond is rich in residue that cutting and grinding will be very difficult. Once you want to get some unique inclusions very urgently, it is likely to cause the whole diamond to be broken and damaged. Because of this, you need to be extra careful when embedding. Pure natural black diamonds are usually completely opaque and have a very high texture. Sometimes, people confuse black diamonds with colorless diamonds with black capsules. The black capsule in this colorless diamond is a pure natural chemical substance, which is captured by crystallization under the condition of crystallization. The actual value of this kind of diamond is far lower than the correct black diamond.
In fact, many diamonds are gray at first, and there are a lot of residues in them. Everyone will dissolve the cracked diamond at high temperature/low pressure, so that the broken part will be graphitized, and finally the diamond will turn black; People who shine on diamonds with bad colors will also produce dark green similar to black. Most black diamonds used in jewelry and marriage proposal rings are produced by decoloration.
Black diamonds are likely to contain hundreds or even thousands of tiny cracks, which may make black diamonds more easily damaged by sharp tools than colorless diamonds, especially when the gap is on the cleavage plane, which may lead to cracks on the surface, or they may break immediately if they accidentally fall to the ground.
When cleaning black diamonds, like other fragile spar, try not to use steam cleaning or ultrasonic cleaning machine to avoid damage to diamonds.
Among colored diamonds, black diamond is a very different color. It is not publicity and calmness, but a conspicuous and secret appearance. Black has always been included in the low-cost industrial production of diamonds, but now, the natural color of black diamonds is called "colorful black that occupies a place in high-end jewelry". Black diamonds exist in Brazil and Central Africa, with a single origin and limited production.